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PRELIMINARY DATA

January, 15 2003

SMA540B

Active Biased RF Transistor

SOT323-4L (SC70)

ORDER CODE

SMA540BTR

BRANDING

TBD

Bias, 4

C, 3

B, 1

E, 2

Bias

Bias, 4

C, 3

B, 1

E, 2

Bias

Bias, 4

C, 3

B, 1

E, 2

Bias

• HIGH GAIN LOW NOISE AMPLIFIERS

• CURRENT EASY ADJUSTABLE BY AN

EXTERNAL RESISTOR

• OPEN COLLECTOR OUTPUT

• TYPICAL SUPPLY VOLTAGE: 1.4-3.3 V

• TRANSITION FREQUENCY 42 GHz

• ULTRA MINIATURE SOT323-4L PACKAGE

(LEAD FREE)

APPLICATIONS

• WIDEBAND APPLICATIONS

• CELLULAR AND CORDLESS TELEPHONES

• HIGH FREQUENCY OSCILLATORS

DESCRIPTION

The SMA540B is a NPN Transistor integrating a cur-

rent mirror as biasing. In this way the IC (collector

current) can be controlled setting the current at Bias

pin according to IC = 10 * IBIAS. The IBIAS current

is easy adjustable using an external resistor.

SMA540B is housed in ultra miniature SOT323-4L

package(LEAD FREE), the relative dimensions are

1.15mmx1.8mm with 0.8mm thickness.

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

Collector emitter voltage

4.5

V

Emitter base voltage

1.5

V

Collector current

40

mA

Base current

4

mA

BIAS Current

4

mA

120

mW

Operating temperature

-40 to +85

Storage temperature

-65 to +150

Max. operating junction temperature

150

Thermal Resistance Junction soldering point

< 270

THERMAL RESISTANCE